40 Argon/ 39 Argon Dating of Pseudotachylyte from Cenozoic and Mesozoic Detachment Faults and Reverse-Sense Mylonite Zones, Southern California: Methodology and Interpretation

9814779 Axen假玄武玻璃岩是一种断层岩，由精细粉碎的围岩和熔体的不均匀混合物组成，可能是断层运动期间高瞬时摩擦热造成的。 虽然非常复杂的材料，它理论上提供了活动断层的可能性，假设它是在断层作用期间产生的，并且一些辐射时钟系统在假玄武玻璃形成期间被重置。 本项目将通过研究几种同位素测年系统、理论扩散模型和使用天然和人工材料的校准技术来解决这一问题。 预计结果将有助于了解假玄武玻璃的形成，并提供如何使用它来确定断层运动的洞察力。

9814779Axen Pseudotachylyte is a type of fault rock consisting of a heterogeneous mixture of finely cominuted wall rock and melt likely caused by high transient frictional heating during fault movement. Although very complex material, it does theoretically offer the possibility of dating active faulting, assuming that it is produced during faulting and that some radiometric clock system is reset during pseudotachylyte formation. This project will address this problem by investigating several isotopic dating systems, theoretical diffusion models and calibration techniques using natural and artificial material. Results are expected to help understand pseudotachylyte formation and to provide insight into how it might be used to date fault movements.***